Gas-heater.



W. WHITE.

GAS HEATER.

APPLICATION mio SEPT. 15, |914.

Patented Ju1y11,1916.

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W. WHITEl` GAS HEATER. APPLICATION FILED SEPT. l5, l9l4.

Patented July 11, 1916.

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WILLIAM WHITE, or LONDON, ENGLAND.

GAS-HEATER.

Specification of Letters Patent.

Patented July 11, 1916.

Application led September 15., 1914. .A Serial No. 861,880.

To all whom t may concern Be it known that I, WILLIAM Nrrrrn, subject of the King of Great' Britain, residing at London, N., England, have invented certain new and useful Improvements in Gas- Heaters, of Iwhich the following is a speci-` fication.

This invention relates to portable gas heaters for heating kettles, and for other like purposes hitherto lcommonly .eected by means of the so-called gas ring or atmospheric or Bunsen burner.

The object of the present invention is to provide a small heater which will be more efficient than the type Of burner referred'to, as regards consumption of gas, and will at the same time avoid the disadvantages com#y mon to that type of burner, namely, the generation of pernicious fumes, the disturbance and frequent extinction of the fiames, especially when lowered, the liability of the gas flashing back and becoming ignited at the gas nozzle, and the danger of accidental ignition of inflammable material brought near to the burner, due to the exposed flame.

The invention consists in the provision of burners of the non-atmospheric type within a chamber or guard, means for preheating air and admitting such preheated air to the chamber in which the gas is burnt, and means for supporting the kettle'r or other utensil on top of the chamber so that the hot gases of combustion are conducted without mixture of cold air, into contact with the utensil before being allowed to escape.'

In the accompanying drawings, Figure l is a sectional elevation of one form of heater according to the' invention, Fig. 2 being a similar view of another form. Fig. 3 is a sectional plan on lll-lll of Fig. 1. Fig. 4 is a plan of the utensil support.

ln carrying out the invention according to one mode, a cylindricalpcasing a., of sheet metal or other suitable material is provided with two or more radially arranged gas burners for example of the well known union-jet type. The burners l) are conveniently screwed into a-circular pipe c surn rounding the casing a., vided with a nipple (Zfto receive a flexible pipe or other gas connection. The casing a is preferably made in two p arts, an upper part formed with slots c 1n its lower edge to correspond with the burners 7), and a lower part of slightly greater size so that it will receive the lower edge of the upper part the pipe c being prop and support it. The lower part of the casing has a wire-work or perforated bottom f which, as shown in Fig. 1, may be made in one piece with the sides, and a removable wire-work or perforated top g which can rest on a ledge h or supports conveniently formed by rolling or otherwise pressing a groove in the outer surface of the lower cylindrical part of the casing.

The perforated top g is arranged fairly close to the burners b so that it will be heated by the heat radiated from the flames, and 1n order that this heat shall be more effectively conducted to the perforated bottom a metal'conductor such as a metal bolt t surrounded by a tubular distance piece or sleeve 7c may be arranged between them.

The function of the perforated metal diaphragms f and g is to form an obstruction located beneath the burners for'the supply of air for combustion, and also to form hot contact surfaces through and over which the cold air passes on its upward way to the.

burners and thereby becomes preheated. The space between the twodiaphragrns constitutes a chamber in which the air dwells for ashort time owing to the-reduced upward velocity in this chamber arising from 'the larger area of flow. The parallel spaced obstructions and g thus perform three functions-A-frst form diaphragms to restrict the excess quantity of air passing to the burners over that required for complete combustion of the gas, and ofcourse thereby increase the temperature of the gases, second, preheat the air and, third, give the air a dwell or period of reduced velocity when passing through the preheating chamber located between the diaphragms.' The heating effect obtained during this dwell or pause may be increased by providing a suitable contacting mass of fine wire or the like Z in the space between the hot perforated obstructing walls f and g located beneath the burners in the upward path of the cold air for combustion passing to the burners. It may beeadded at this point that the top plate m also aids in controlling the air suply to the burners as it has the same effect as the dampers used with o-rdinary fires without any manipulation.

The casing will thus comprise two chambers, one the burner chamber and the other a hot air chamber'or preheater. The top of the 'casing may be formed vwith a perforated plate or a grid m fitted with studs n to support the kettle or other utensil at the required height to permit of the escape of the hot gases of combustion while insuring adequate contact of the same with the utensil. The grid m preferably has a central opening m', F ig. 4L, which tends to concentrate the hot products of combustion on the center of the utensil whence they spread out evenly all around.

When the stove is in use, all the air` for combustion is compelled to pass through the preheater, being heated by the perforated bottom f and top g of the lower chamber as well as by the conductors such as the loosely arranged wire Z between them. forations may be so regulated as to size and number and that only the requisite amount of air shall enter, and the upper part of the casing incloses the burners and forms a guard, the flames burn steadily and without disturbance.- Moreover, practically complete combustion is effected so that the hot gases which do escape are practically odorless. Further, as all the hot gases strike the utensil and no cold air mixes with them, as in the ordinary open gas ring, the efficiency of the heater is greatly enhanced.

The burners may be turned down very low with safety, as the flames are well guarded against draft, so that water or food may be kept warm with an extremely low consumption of gas.

The casingv may be supported on legs 0 as indicated in F ig. l or the casing may be extended as indicated in Fig. 2. In this form it is provided with `an adequate number of air inlet openings p. In order to avoid injury to a table or other support on which the heater may be placed, a plate Q may be provided above the lower edge of the eX- tended casing, the plate g forming a nonperforated diaphragm. The part of the casing beneath the plate g is provided with air inlets r to allow cool air to pass between the non-perforated diaphragm g and the table or support whereby damage to the table is prevented. If desired the casing a may be supported in an outer casing or jacket as indicated at s in Fig. 2, the jacket s being provided with perforations t for the admission of air to the perforated bottom 7 of the lower part of the casing.

The casing is shown as cylindrical but the Copies of this pat-ent may be obtained for five cents each, by addressing the As the perinvention is not confined shape.

I claim l. A portable heater comprising a gas burner of the non-atmospheric type, a casing around said burner and closing the burner in laterally, said casing having air inlet openings located beneath theburner, an air and gas obstruction plate over the burner and acting also as a utensil support, spaced perforated diaphragms located beneath the burner and above the air inlet openings in the casing and a conductor interposed between said diaphragms and holding them in spaced relation.

2. A portable heater comprising a gas burner of the non-atmospheric type, a casing aro-und said burner and closing the burner in laterally, said casing having air. inlet openings located beneath the burner, an air and gas obstruction plate over the burner and acting also as a utensil support, spaced perforated diaphragms located beneath the burner and above the air inlet openings in the casing a conductor interposed between said diaphragms and holding them in spaced relation,` and a non-perforated diaphragm located within said casing beneath the air inlet openings thereto.

3. A portable heater comprising a gas burner of the non-atmospheric type, around said burner and closing the burner in laterally, said casing having air inlet openings located beneath the burner, an air and gas obstruction plate over the burner and acting also as a utensil support, spaced perforated diaphragms located beneath the to this particular burner and above the air inlet openings in,

the casing, a conductor interposed between said diaphragms and holding them in spaced relation and an outer jacket around said casing and spaced therefrom, said outer jacket having air inlets located opposite the inlets in the casing, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

WILLIAM WHITE.

Witnesses:

A. W. MATHYs, B. CLARK.

Commissioner of Patents,

' Washington, D. C.

a casing 

